However, that’s not exactly what’s going on. Apple isn’t actually saving the photos in a specific folder — they are simply being stored locally on your device, The Verge reports.

The little-known feature was introduced with the launch of i0S 10 in mid-2016 when Apple’s iPhone Photos app began using metadata analysis and image-recognition technology to sort users’ photos automatically and tag them for easy extraction.

There are thousands of objects your iPhone can identify. Categories include everything from various animals, food and fashion to inanimate objects like furniture and all of those sunset snaps you’ve taken.

Weirdly though, despite not having categories for “nude,” or “underwear,” there are plenty of categories for bra: brassiere, bandeau, bandeaus, bra, bras, and brassieres.

The function actually makes riffling through all the photos on your phone a whole lot easier. However, it seems many iPhone users were unaware it even existed. Hence the panic.